Keyway-forming member for use on highway forms



June 1, 1965 A. F. cRoNE v 3,185,676

KEYwY-FORMING MEMBER FOR USE ON HIGHWAY FORMS Filed Maron 4, 19ers 2 sheets-sheet V1 @A j 24 35) (vxsgw ATTORNEYS June 1, 1965 A. F. cRoNE 3,186,676

KEYWAY-FORMING MEMBERv FOR USE ON HIGHWAY FORMS Filed March 4, 1963 2 Sheets-Sheet 2 ',IIII 'I A T TRNE'YS.

United States Patent O" 3,186,676 KEYWAY-FORMING MEMBER FDR USE N HIGHlVAY FRMS Alfred F. Crone, Williamsville, NX., assignor to Acme Highway Products Corporation, Budalo, NY. Filed Mar. 4, 1963, Ser. No. 262,526 4 Claims. (Cl. 249-9) This invention relates to keyway-forming members for use in connection with forming keyways in the longitudinal edges of highway pavement strips.

In the construction of highways comprising two or more longitudinal strips of concrete or other road-forming material, it is customary to form the longitudinal edges of the adjacent str-ips in such a manner as to form a keyway on one of the strips into which an integral key of the other strip extends, for the purpose of holding the two strips against vertical displacement relatively to each other. The forming of a keyway in one of the strips is accomplished by securing to the paving form for forming the inner edge of the strip a keyway-forming member facing the strip to be poured and consequently, after the concrete has hardened the form may be removed, thus leaving the keyway in the inner edge of the strip facing the adjacent strip to be poured. Consequently concrete-of the second strip will pass into the keyway and after hardening will hold the two strips in horizontal alinement. The keyway-forming members are removably applied to the forms so that the forms can again be used for forming highway str-ips which do not require a keyway.

It is one of the objects of this invention to provide keyway-forming members of improved and durable construction which is capable of withstanding the rough usage to which these forms are subjected, without damage to these members.

It is also an object to provide open-faced keyway-forming members of this type provided with reinforcing members of improved and simpliiied construction, thus permitting these members to be made of extruded plastic material or of steel members secured together.

A further object is to provide keyway-forming members which are so constructed as to provide clear keyways in the concrete, without permitting concrete to enter the keyway during the pouring of the pavement strip.

In the accompanying drawings:

FIG. l is a fragmentary face view of a pair of highway forms arranged in abutting relation to each other and having keyway-formingrmembers embodying this invention applied thereto.

FIG. 2 is a similar view thereof showing the ends of the two paving forms spaced apart.

FIG. 3 is an end elevation of a paving form on an enlarged scale having the keyway-forming member applied thereto, the view being taken when looking in the direc tion indicated bythe arrows on line 3-3, FIG. 2.

FIG. 4 is a sectional elevation thereof on line 4 4, FIG. 2.

FIG. 5 is a longitudinal, central sectional elevation of theV keyway-forming member having an alining or coupling member secured to the end portion thereof for .cooperation with an adjacent keyway-forming member.

FIG. 6 isa, sectional view thereof on line 6 6, FIG. 5.

FIG. 7 is an elevation of two adjoining paving forms applied thereto.

Patented June l, 1965 FIG. 8 is a view similar to FIG. 2 showing the two paving forms spaced apart.

FIG. 9 is anend elevation thereof as seen from line 5i- 9, FIG. 8, on an enlarged scale.

FIG. 10 is a sectional elevation thereof on line 10-10,

FIG. 8. v

FIG. 11 is a transverse, sectional elevation of the keyway-forming member.

In the construction shown in FIGS. 1-6, 15 represents a highway paving form such as commonly employed in connection with the forming of longitudinal edges of concrete pavements. Concrete is poured against the surface 16 thereof. These paving forms are in common use for forming the longitudinal edges of paving strips and further description of the same is not deemed necessary.

When these paving forms are used in connection with the pouring of concrete or other paving material for a highway of two or more strips in width, the longitudinal edge of a strip to which an edge of an adjoining strip is to be connected, is provided with a part to be interlocked with the adjoining strip to prevent the strips from moving vertically relatively to each other. This interlocking connection is generally in the form of a tongue and groove connection formed in the paving material itself. The groove or keyway is formed by means of a suitable keyway-forming member releasably secured to the form 15 so that this form can also be used at the side of a highway strip in which no keyway is required. This invention relates particularly to the keyway-forming member to be applied to a paving form.

In the construction shown in FIGS. 1-6, the keywayforming member is preferably made ofl a plastic material which may be formed by extrusion. This keyway-forming member has an upright wall 20 terminating in upper and lower walls 21 and 22 formed integral with the upright than the upper and lower walls 21 and 22, and the advan,

vtage of this construction is illustrated in FIG. 6, in which the broken line 25 corresponds to the surface of the upright wall 16 of the paving form. It will be noted that the Yupper and lower walls 21 and 22 extend into contact with .the surface 25 of the paving form, while the ribs 24 are spaced therefrom. The advantage of this construction is that when the keyway-forming member is secured to the .upright wall of a form, the edges of the upper and lowerv walls 21 and 22 will lie in direct contact with the wall 16 of the paving formand thus prevent concrete from passing between the wall- 16 of the form and the upper and Vlower walls 21 and 22 of the keyway-forming member into the interior of this member. Any concrete in' the interior of this member would of 'course interfere with having the keyway receive concrete from thevadjacent paving strip to form an interlocking key between'the two strips. In the case of severe pressure or `blows applied to the upright wall 20 ofthe keyway-formingmember, this member maya-be deiected to the extent of having the The paving forms are provided in their walls 16 atV intervals with holes through which bolts may .pass for securing the keyway-forrning member to the upright wall of the paving form, and in FIG. 4 is shown a keywayforming member applied to the paving form by means of bolts 23 each having a head 29 and a nut iiigthe bolt passing through the keyway-forming member through a hole formed therein midway between the upper and ylower edges thereof. The hole in that case would pass between the ribs 24.

When the keyway-forming member is bolted to the paving form the ribs 24 will Vcontact the Wall 16 and thus prevent further deformation of the keyway-forming member but at the same ytime permit forcing the edges of the top and bottom walls 21 and 22 into tight .contact with the paving form.

It is generally desirable to provide a connecting or alining member between theadjacent ends of .the paving forms such as a connecting member 32 which as shown in FIG. 6, extends between the two ribs 24. This connecting member shown by way of example, is of hoilow, rectangular form and may also be of extruded plastic material. One end of the connecting member may be secured to one of the keyway-forming members adjacent to one endfthereof in any suitable manner, for example, by means of staples 33, leaving the other ends of the connecting members projecting beyond the end of its keywayforming member. The other end may then be inserted into the keyway-forming member of an adjacent paving form by passing the connecting member between the ribs 24 of such keyway-forming member.Y When .the'two paving forms are connected by means of a connecting member, as shown in FIG. l, the forms 15 will be in correct alinement with each other and the two keyway-forming members will form a continuous keyway in a pavement strip..

In order to facilitatesthe securing of the connecting member 32 into the correct position between two ribs 24, these ribs may be provided with inwardly extending flanges 35 so that the connecting member 32ts snugly and is securely held between the two adjacent keyway-forming members. Y

It is also possible to make the keyWay-forming member of metal, as shown in FIGS. 741. In this case the paving formsV may be identical with those shown in FIGS. l-6, being provided with upright webs 16 to which the keyway-forming member may be removably secured'so that the pavingforms may be used in connection with the edges of the pavement stripswhich do not require keyways; A Y Y The keyway-forming member :in this construction is provided with a metal member of the shape required for forming a keyway inthe edge of a paving strip, for example, with an uprightY wall or web 5G formed integral with upper and lower diverging walls V51 and 52. VThe keywayforniing member is reinforced by meansof a member 53 which may be of channel shape having a web 54 suitably secured to theunderface of thevupright wall 5), for example, by means of welding, and having downwardly extending webs or flanges 55 and 56, the free ends of which however do not extend from the upright -wall of the keyway-forming memberto the same exv tent as the upper and lower walls'51` and/52 so that this v 52 with the upright Vwallof the `form 15 to Yprevent concrete from entering into the interior ofthe keyway-'forrning member. Y Y' The keyway-forming member is of coursesecured to the upright wall of the paving form, for example, either Vby bolts as shown'in FIG. 4 or bymeans of arboit or screw Y 5S, FIG..10,-extending through alined holes in the paving form and the keyway-forming member and having a threaded engagement with a hub of an anchoring member 59. The keyway-forming member shown in FIGS. l-6 may of course also be secured `to the paving form by the construction shown in FIG. l0. The bolt or screw 5S will consequently pull the ends of the upper and lower walls 51 and 52 tightly into engagement with the upright wall 16 of the paving form. The channel-shaped member 53 will reinforce the walls 50, 51 and 52 in the same manner as described in connection with the ribs 24 of FIGS. 1 6 and permit the edges of the upper and lower walls 51 and 52 to contact rmlywith the form wall 16. An alining or connecting member 60 is also used in connection with the keyway-forming members described and may be in the form of a rod or bar of such shape as to iit into the spaces between the walls 55 and 56. This bar is of a width equal approximately to the length of the webs 55 and' of the reinforcing member so that it will not hold the edges ofthe upper and lower walls 51 and 52 out of contact with the paving form. The connecting member may be secured partly within the channelshapedrrnember of one of the keyway-forming members in any suitable manner, for example, by means of the screw 5S, FIG. 8. By making the keyway-forming members of the constructions shown with open faces adjacent to the paving form 15, a better concrete-tight seal is made with theY form so that the keyways formed in the paving strips will be free from concrete, thus ensuring a good interlock between adjacent pavement strips.

It will be understood that Various changes in the detaiis, materials and arrangements of parts which have been herein described and `illustrated in order to explain the nature of the invention may be made by those skilled in the art within the principle and scope of the inventio as lexpressed in the appended claims.

I claim:

Y 1. A keyway-orming member for attachment to a paving form for use in pouring highway strips,

said member being slightly elastic and of channel shape including an upright wall having diverging upper and lower Walls formed integral therewith and forming an open, interior space between said walls, and a reinforcing rib extending into saidr space from said upright wall and terminating adjacent to said V2.- A keyway-forming member according to claim 1 and including lan additionalreinforcing rib spaced from said first mentioned rib, A i

and a connecting member extendingfbetween said ribs Y at one' end of said keywayeforming member and extending outwardiy' from anend of the Vsame for entrance between the ribs of a keyway-forming member Y of an adjacent paving `form Afor alining two paving gforms.`

3. `A keyway-formingmember` accordingito` claim 2 lin which said reinforcing ribs terminate at their free'ends 1n Y y i flanges extending toward each other from said freeends for confining saidconnecting member, said flanges being .positionedto engage a paving form to limit the extent to which'A said upright wall may move toward said paving form.

V4. A keyway-forming men-thereforv attachment paving form for use in pouring highway strips,

said member being of slightly elastic .materialV and of channely shape including an upright wall'having ditoa verging upper and lower walls formed integral therewith and forming an open, interior space between said walls,

and a metal reinforcing member of channel shape secured to said keyway-forming member and having 5 flanges extending into said open space, the edges 0f said upper and lower Walls extending outwardly from said upright wall to a greater extent than the edges of said anges, for contact with said paving form of contact with said paving form.

References Cited by the Examiner UNITED STATES PATENTS Naugle 25-118 Weller 25-119 James.

Lewis 25-118 Heltzel 25--118 WILLIAM I. STEPHENSON, Primary Examiner.

MICHAEL V. BRINDISI, Examiner. 

1. A KEYWAY-FORMING MEMBER FOR ATTACHMENT TO A PAVING FORM FOR USE IN POURING HIGHWAY STRIPS, SAID MEMBER BEING SLIGHTLY ELASTIC AND OF CHANNEL SHAPE INCLUDING AN UPRIGHT WALL HAVING DIVERGING UPPER AND LOWER WALLS FORMED INTEGRAL THEREWITH AND FORMING AN OPEN, INTERIOR SPACE BETWEEN SAID WALLS, AND A REINFORCING RIB EXTENDING INTO SAID SPACE FROM SAID UPRIGHT WALL AND TERMINATING ADJACENT TO SAID PAVING FORM IN POSITION TO CONTACT WITH SAID FORM IF SUFFICIENT PRESSURE IN EXERTED ON SAID UPRIGHT WALL TO PREVENT EXCESSIVE DEFORMATION OF SAID MEMBER, SAID UPPER AND LOWER WALLS HAVING THEIR FREE EDGES SPACED FROM SAID UPRIGHT WALL TO A GREATER EXTENT THAN THE FREE EDGES OF SAID RIB TO CONTACT WITH A PAVING FORM TO PREVENT CONCRETE FROM PASSING BETWEEN SAID FORM AND THE EDGES OF SAID UPPER AND LOWER WALLS AND INTO SAID SPACE. 